Most of the work will affect the pond near the Highland Drive trailhead, the parks department said, as well as the Highland Drive trailhead, the Bishop Peak Trail and the Patricia Drive and Felsman Loop trailheads, the department said.

“We’re not restricting access, we’re just closing little sections for safety,” said Doug Carscaden, the ranger services supervisor for the parks and recreation department. “You’ll have access to everything, you just might have to walk a little bit of a different route than you planned.”

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Carscaden added that authorities will either cordon off the affected trails or have rangers there to direct people to another trail.

There also could be trail closures for several days after workers finish treatment, so hikers might face detours until May 22.

And in case you’re thinking about sneaking onto a closed portion anyway, don’t try it. The parks department will have rangers posted to enforce those closures, and fines for trespassing could reach up to $561.